WARNING: line length of 89 exceeds 80 columns
#49: FILE: net/l2tp/l2tp_core.c:1290:
+		udp_len = l2tp_session_udp_hdrlen(session) + session->hdr_len + data_len;

total: 0 errors, 1 warnings, 0 checks, 83 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit b08e657c74d6 ("l2tp: unify headroom calculation") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 1 warnings, 0 checks, 83 lines checked